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177aad3ff6
This patch eliminates the "compatibility defines" _IO_UNIFIED_JUMPTABLES (always defined to 1, used in a number of #ifs which are therefore always false), _STDIO_USES_IOSTREAM (unused), __HAVE_COLUMN (unused), _IO_BE (replaced with __glibc_unlikely), and yet another redundant definition of EOF. Installed stripped libraries are unchanged by this patch. * libio/libio.h (_IO_UNIFIED_JUMPTABLES, _STDIO_USES_IOSTREAM) (__HAVE_COLUMN, _IO_BE): Don't define. (_IO_peekc_unlocked, _IO_getwc_unlocked, _IO_putwc_unlocked) (_IO_fwide_maybe_incompatible): Use __glibc_unlikely. * libio/libioP.h (EOF): Don't define. * libio/iofdopen.c, libio/iofopen.c, libio/iopopen.c * libio/iovdprintf.c, libio/oldiofdopen.c, libio/oldiofopen.c * libio/oldiopopen.c, debug/vdprintf_chk.c: Remove #if block testing _IO_UNIFIED_JUMPTABLES.
242 lines
6.9 KiB
C
242 lines
6.9 KiB
C
/* Copyright (C) 1998-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Per Bothner <bothner@cygnus.com>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#define _IO_USE_OLD_IO_FILE
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#include "libioP.h"
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#include <signal.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
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struct _IO_proc_file
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{
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struct _IO_FILE_complete_plus file;
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/* Following fields must match those in class procbuf (procbuf.h) */
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pid_t pid;
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struct _IO_proc_file *next;
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};
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typedef struct _IO_proc_file _IO_proc_file;
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static struct _IO_proc_file *old_proc_file_chain;
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#ifdef _IO_MTSAFE_IO
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static _IO_lock_t proc_file_chain_lock = _IO_lock_initializer;
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static void
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unlock (void *not_used)
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{
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_IO_lock_unlock (proc_file_chain_lock);
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}
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#endif
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FILE *
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attribute_compat_text_section
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_IO_old_proc_open (FILE *fp, const char *command, const char *mode)
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{
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volatile int read_or_write;
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volatile int parent_end, child_end;
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int pipe_fds[2];
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pid_t child_pid;
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if (_IO_file_is_open (fp))
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return NULL;
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if (__pipe (pipe_fds) < 0)
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return NULL;
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if (mode[0] == 'r' && mode[1] == '\0')
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{
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parent_end = pipe_fds[0];
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child_end = pipe_fds[1];
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read_or_write = _IO_NO_WRITES;
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}
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else if (mode[0] == 'w' && mode[1] == '\0')
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{
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parent_end = pipe_fds[1];
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child_end = pipe_fds[0];
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read_or_write = _IO_NO_READS;
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}
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else
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{
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__close (pipe_fds[0]);
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__close (pipe_fds[1]);
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__set_errno (EINVAL);
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return NULL;
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}
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((_IO_proc_file *) fp)->pid = child_pid = __fork ();
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if (child_pid == 0)
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{
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int child_std_end = mode[0] == 'r' ? 1 : 0;
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struct _IO_proc_file *p;
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__close (parent_end);
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if (child_end != child_std_end)
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{
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__dup2 (child_end, child_std_end);
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__close (child_end);
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}
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/* POSIX.2: "popen() shall ensure that any streams from previous
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popen() calls that remain open in the parent process are closed
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in the new child process." */
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for (p = old_proc_file_chain; p; p = p->next)
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__close (_IO_fileno ((FILE *) p));
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execl ("/bin/sh", "sh", "-c", command, (char *) 0);
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_exit (127);
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}
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__close (child_end);
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if (child_pid < 0)
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{
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__close (parent_end);
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return NULL;
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}
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_IO_fileno (fp) = parent_end;
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/* Link into old_proc_file_chain. */
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#ifdef _IO_MTSAFE_IO
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_IO_cleanup_region_start_noarg (unlock);
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_IO_lock_lock (proc_file_chain_lock);
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#endif
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((_IO_proc_file *) fp)->next = old_proc_file_chain;
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old_proc_file_chain = (_IO_proc_file *) fp;
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#ifdef _IO_MTSAFE_IO
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_IO_lock_unlock (proc_file_chain_lock);
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_IO_cleanup_region_end (0);
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#endif
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_IO_mask_flags (fp, read_or_write, _IO_NO_READS|_IO_NO_WRITES);
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return fp;
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}
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FILE *
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attribute_compat_text_section
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_IO_old_popen (const char *command, const char *mode)
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{
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struct locked_FILE
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{
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struct _IO_proc_file fpx;
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#ifdef _IO_MTSAFE_IO
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_IO_lock_t lock;
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#endif
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} *new_f;
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FILE *fp;
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new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
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if (new_f == NULL)
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return NULL;
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#ifdef _IO_MTSAFE_IO
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new_f->fpx.file.file._file._lock = &new_f->lock;
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#endif
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fp = &new_f->fpx.file.file._file;
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_IO_old_init (fp, 0);
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_IO_JUMPS_FILE_plus (&new_f->fpx.file) = &_IO_old_proc_jumps;
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_IO_old_file_init_internal ((struct _IO_FILE_plus *) &new_f->fpx.file);
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if (_IO_old_proc_open (fp, command, mode) != NULL)
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return fp;
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_IO_un_link ((struct _IO_FILE_plus *) &new_f->fpx.file);
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free (new_f);
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return NULL;
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}
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int
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attribute_compat_text_section
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_IO_old_proc_close (FILE *fp)
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{
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/* This is not name-space clean. FIXME! */
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int wstatus;
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_IO_proc_file **ptr = &old_proc_file_chain;
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pid_t wait_pid;
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int status = -1;
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/* Unlink from old_proc_file_chain. */
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#ifdef _IO_MTSAFE_IO
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_IO_cleanup_region_start_noarg (unlock);
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_IO_lock_lock (proc_file_chain_lock);
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#endif
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for ( ; *ptr != NULL; ptr = &(*ptr)->next)
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{
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if (*ptr == (_IO_proc_file *) fp)
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{
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*ptr = (*ptr)->next;
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status = 0;
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break;
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}
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}
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#ifdef _IO_MTSAFE_IO
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_IO_lock_unlock (proc_file_chain_lock);
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_IO_cleanup_region_end (0);
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#endif
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if (status < 0 || __close (_IO_fileno(fp)) < 0)
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return -1;
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/* POSIX.2 Rationale: "Some historical implementations either block
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or ignore the signals SIGINT, SIGQUIT, and SIGHUP while waiting
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for the child process to terminate. Since this behavior is not
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described in POSIX.2, such implementations are not conforming." */
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do
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{
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wait_pid = __waitpid (((_IO_proc_file *) fp)->pid, &wstatus, 0);
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}
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while (wait_pid == -1 && errno == EINTR);
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if (wait_pid == -1)
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return -1;
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return wstatus;
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}
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const struct _IO_jump_t _IO_old_proc_jumps libio_vtable = {
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JUMP_INIT_DUMMY,
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JUMP_INIT(finish, _IO_old_file_finish),
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JUMP_INIT(overflow, _IO_old_file_overflow),
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JUMP_INIT(underflow, _IO_old_file_underflow),
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JUMP_INIT(uflow, _IO_default_uflow),
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JUMP_INIT(pbackfail, _IO_default_pbackfail),
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JUMP_INIT(xsputn, _IO_old_file_xsputn),
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JUMP_INIT(xsgetn, _IO_default_xsgetn),
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JUMP_INIT(seekoff, _IO_old_file_seekoff),
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JUMP_INIT(seekpos, _IO_default_seekpos),
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JUMP_INIT(setbuf, _IO_old_file_setbuf),
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JUMP_INIT(sync, _IO_old_file_sync),
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JUMP_INIT(doallocate, _IO_file_doallocate),
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JUMP_INIT(read, _IO_file_read),
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JUMP_INIT(write, _IO_old_file_write),
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JUMP_INIT(seek, _IO_file_seek),
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JUMP_INIT(close, _IO_old_proc_close),
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JUMP_INIT(stat, _IO_file_stat),
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JUMP_INIT(showmanyc, _IO_default_showmanyc),
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JUMP_INIT(imbue, _IO_default_imbue)
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};
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strong_alias (_IO_old_popen, __old_popen)
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compat_symbol (libc, _IO_old_popen, _IO_popen, GLIBC_2_0);
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compat_symbol (libc, __old_popen, popen, GLIBC_2_0);
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compat_symbol (libc, _IO_old_proc_open, _IO_proc_open, GLIBC_2_0);
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compat_symbol (libc, _IO_old_proc_close, _IO_proc_close, GLIBC_2_0);
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#endif
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